Warbling Vireos are smaller and browner than Red-eyed Vireos, without the strong face pattern or contrast between the head and back that Red-eyed shows. Warbling Vireos have dingy white underparts; Red-eyed's are clean white.
Tennessee Warblers are daintier than Red-eyed Vireos. They forage more quickly and have smaller, sharper bills. Tennessee Warblers have a less distinct face pattern, without the Red-eyed's dark stripe above the pale eyebrow stripe.
Philadelphia Vireos are smaller than Red-eyed Vireos, with a smaller bill. Philadelphia's face is less strongly marked, without the gray head and dark line below the crown. It usually has a yellow breast and is never as clean white as Red-eyed.
Black-whiskered Vireos live mainly in mangrove and other coastal forests. They overlap with Red-eyed Vireos during migration. Black-whiskered Vireos have a dark stripe on the throat that Red-eyed Vireos lack.